<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<style>
  div{
      border-width: 15px;
      border-color: orange;
      /*
        none:默认无边框
        dotted:点线边框
        dashed:虚线边框
        solid:实线边框
        double:定义两个边框，两个边框的宽度和border-width的值一致
        groove: 3D沟槽边框
        ridge: 3D脊边框
        inset: 3D的嵌入边框
        outset: 3D突出边框
      */
      border-style: outset;
  }
</style>

<body>
    <div>我爱打篮球！</div>

</body>
</html>